Rowing machine



FIG. 1 is a side perspective view of a rowing machine showing my new design;

FIG. 2 is a perspective view of the side opposite that shown in FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom perspective view thereof;

FIG. 5 is a front perspective view thereof; and,

FIG. 6 is a rear perspective view thereof. 

The ornamental design for a rowing machine, as shown and described. 